重写跳转

public static string ResolveUrl2(string relativeUrl)
{
if (relativeUrl == null) throw new ArgumentNullException("relativeUrl");

if (relativeUrl.Length == 0 || relativeUrl[0] == '/' ||
relativeUrl[0] == '\') return relativeUrl;

int idxOfScheme =
relativeUrl.IndexOf(@"://", StringComparison.Ordinal);
if (idxOfScheme != -1)
{
int idxOfQM = relativeUrl.IndexOf('?');
if (idxOfQM == -1 || idxOfQM > idxOfScheme) return relativeUrl;
}

StringBuilder sbUrl = new StringBuilder();
sbUrl.Append(HttpRuntime.AppDomainAppVirtualPath);
if (sbUrl.Length == 0 || sbUrl[sbUrl.Length - 1] != '/') sbUrl.Append('/');

// found question mark already? query string, do not touch!
bool foundQM = false;
bool foundSlash; // the latest char was a slash?
if (relativeUrl.Length > 1
&& relativeUrl[0] == '~'
&& (relativeUrl[1] == '/' || relativeUrl[1] == '\'))
{
relativeUrl = relativeUrl.Substring(2);
foundSlash = true;
}
else foundSlash = false;
foreach (char c in relativeUrl)
{
if (!foundQM)
{
if (c == '?') foundQM = true;
else
{
if (c == '/' || c == '\')
{
if (foundSlash) continue;
else
{
sbUrl.Append('/');
foundSlash = true;
continue;
}
}
else if (foundSlash) foundSlash = false;
}
}
sbUrl.Append(c);
}

return sbUrl.ToString();
}